Anyone have one and how do you like it. Looking to build something different.

I've been thinking about one for a hunting build. I keep going between 300blk and 458 and can't decide. I might have to get both lol

I've got a .458 SBR.  It is an absolute hoot to shoot.  With the can, it feels like a 20ga shotgun in terms of recoil.  The 300gr caliber-specific TSX expands to 0.8" as low as 1K fps or you can sling subsonic 500gr DGS/X bullets that will plow through whatever you're shooting at.  I'll have to look around for a pic but I put one 500gr DGS bullet through three solid bricks before it was stopped and recovered.

I've been thinking about one for a hunting build. I keep going between 300blk and 458 and can't decide. I might have to get both lol

...it's the only way to be sure

Both have their pros and cons.  If you do not reload both can be thief-fully expensive to shoot.  With Lehigh Defense heads both can be devastating.  There is something very impressive with "Hammer of Thor" calibers in an AR 15 platform.  The 458S with a 14.5" barrel and an A2 length stock makes a great large hog hunter.  I prefer the 300BLK with a similar config for smaller ones.  The 300BLK is very nice for deer as well.  I used to hunt deer with a bolt X39 cartridge hand loaded with 30 cal head as far back as 1992.  With the 300 BLK in a bolt config with its large range of weight choices for heads just makes it that much better.